Measurement of the B0–B0 and B0s–B0s production asymmetries in ppcollisions at √s=7 TeV

Abstract

The B0–B0and B0s–B0sproduction asymmetries, AP(B0)and AP(B0s), are measured by means of a time-dependent analysis of B0→J/ψK∗0, B0→D−π+and B0s→D−sπ+decays, using a data sample corresponding to an integrated luminosity of 1.0fb−1, collected by LHCb in ppcollisions at a centre-of-mass energy of 7TeV. The measurements are performed as a function of transverse momentum and pseudorapidity of the B0and B0smesons within the LHCb acceptance. The production asymmetries, integrated over pTand ηin the range 4 <pT<30GeV/cand 2.5 <η<4.5, are determined to be AP(B0) =(−0.35 ±0.76 ±0.28)%and AP(B0s) =(1.09 ±2.61 ±0.66)%, where the first uncertainties are statistical and the second systematic.